"The ambassador answered us that [their right] was founded on the Laws of the Prophet, that it was written in their Koran, that all nations who should not have answered their authority were sinners, that it was their right and duty to make war upon them wherever they could be found, and to make slaves of all they could take as prisoners, and that every Mussulman who should be slain in battle was sure to go to Paradise."
The above passage is not a reference to a declaration by al Qaeda or some Iranian fatwa. They are the words of Thomas Jefferson, then the U.S. ambassador to France, reporting to Secretary of State John Jay a conversation he'd had with Sidi Haji Abdul Rahman Adja, Tripoli's envoy to London, in 1786 -- more than two and a quarter centuries ago.
MORE: http://www.huffingtonpost.com/ali-a-rizvi/an-atheist-muslims-perspective-on-the-root-causes-of-islamist-jihadism-and-the-politics-of-islamophobia_b_3159286.html